60PSI gauge for regular bikes as you'll be in the middle of it's range for the ~30PSI settings, rather than at the very high end and risking damage or getting a less accurate reading.Or an accurate 30psi gauge that is as useful for fat but significantly moar useful for regular bikes.
15PSI gauge for fatties.
https://www.universalcycles.com/shopping/product_details.php?id=8768&category=5448